Re: Lanny and Peter's sunken pot stove

["Tom Miles" <tmiles@trmiles.com>]

Can be seen at:
http://crest.org/discussiongroups/resources/stoves/Still/South%20Africa%202/
SAF2POT.html

Tom

----- Original Message -----
From: "Dean Still" <dstill@epud.net>
To: <stoves@crest.org>
Sent: Thursday, June 06, 2002 5:59 AM
Subject: Lanny and Peter's sunken pot stove


> Dear Stovers,
>
> I'm posting a series of pictures showing details of a prototype Rocket
stove
> that Lanny Hensen and Peter Scott built in Rome, Georgia where Lanny
lives.
> This stove is a sheet metal version of a sunken two pot stove with baking
> oven that Peter is now taking with him to Africa where he is teaching a
> course on stove making. Although this is only a prototype and we are not
> sure of its longevity the photos show construction details that follow
Larry
> Winiarski's Rocket design principles. Further testing will determine where
> in the stove home made refractory ceramic parts need to replace sheet
metal.
>
> The great advantage of sunken pot stoves is: greater pot surface area is
> exposed to heat; therefore there is significantly increased fuel
efficiency.
>
> The heat contacts a pot first as it leaves the Rocket internal chimney.
The
> water or food in the pot keeps pot temperatures relatively cool so that
pots
> do not suffer degradation from heat and flame. If the same heat first
> contacted a griddle it would get very hot and eventually wear away.
>
> If the pot absorbs enough heat then secondary surfaces are not exposed to
> high heat and last longer.
>
> All smoke is obviously carried through the stove and out the chimney
because
> pots fit tightly into holes in the top of the stove.
>
> In this prototype stove, five pounds of water in the first pot boiled in 9
> minutes. Five pounds of water in the second pot boiled in 25 minutes. The
> amount of heat that goes to each pot is determined by the placement of the
> Rocket elbow. In this case, quick boiling in the first pot ( boils corn)
and
> less heat in the second pot (simmers sauce) was accomplished by directing
> heat mostly at the first pot.
>
> A guillotine door slides down between the two pots sending heat around the
> oven in sheet metal ducts. The oven is surrounded by insulation on all
sides
> and has an insulated door. It bakes potatoes in an hour and stays around
> 350F. A griddle can be placed over the first hole to cook tortillas.
>
> The disadvantage of the sunken pot stove is that only specific pots can be
> used since the pot has to fit in the hole. Cooks need to be ok with using
> pots that probably are sold with the stove. The advantage of the sunken
pot
> stove is that a Rocket style two pot stove, depending on pot size, amount
of
> water in pots, etc. will be 30% to 50% fuel efficient.
>
> Lanny does such beautiful work. Those of us who think about stoves can
> imagine the pleasure that having a professionally built model can give.
> Thanks so much to Lanny for his help on this project! (Both this stove and
> Lanny's Wok stove will be cooking food at the next ETHOS (Engineers in
> Technical Humanitarian Opportunities of Service) stove conference, January
> at Seattle University. All are welcome!)
>
> Best,
>
> Dean
>
>
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-
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http://crest.org/discussiongroups/resources/stoves/
>
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Ron Larson, ronallarson@qwest.net
Elsen L. Karstad, elk@wananchi.com www.chardust.com
>
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Other Biomass Stoves Events and Information:
http://www.bioenergy2002.org
http://www.crest.org/articles/static/1/1010424940_7.html Bioenergy
http://www.crest.org/articles/static/1/1011975339_7.html Gasification
http://www.crest.org/articles/static/1/1011975672_7.html Carbon
>
For information about CHAMBERS STOVES
>http://www.repp.org/discussiongroups/resources/stoves/Chambers/Chambers.htm